Loans and Leases Held for Investment and Credit Quality - Summary of Total Loans and Leases and Aging Analysis of Portfolio Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 42,525	$ 27,893
Total Carried at Amortized Cost	1,980,134	1,797,386
Loans Accounted for Under the Fair Value Option	831,426	824,520
Total Loans and Leases	2,811,560	2,621,906
Net Deferred Costs	5,931	5,380
Loan and Leases, Net of unearned	2,817,491	2,627,286
Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,937,609	1,769,493
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25,138	16,954
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17,387	10,939
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,431	13,248
Total Carried at Amortized Cost	611,625	554,241
Loans Accounted for Under the Fair Value Option	361,494	333,313
Total Loans and Leases	973,119	887,554
Commercial & Industrial | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	592,194	540,993
Commercial & Industrial | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12,472	7,895
Commercial & Industrial | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,959	5,353
Commercial & Industrial | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1
Total Carried at Amortized Cost	10,371	8,941
Loans Accounted for Under the Fair Value Option	361	396
Total Loans and Leases	10,732	9,337
Commercial & Industrial | Agriculture | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,370	8,941
Commercial & Industrial | Agriculture | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1
Commercial & Industrial | Funeral Home & Cemetery
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	15,092	14,086
Loans Accounted for Under the Fair Value Option	12,036	12,343
Total Loans and Leases	27,128	26,429
Commercial & Industrial | Funeral Home & Cemetery | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,092	14,086
Commercial & Industrial | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,041	2,309
Total Carried at Amortized Cost	29,918	24,055
Loans Accounted for Under the Fair Value Option	19,826	20,999
Total Loans and Leases	49,744	45,054
Commercial & Industrial | Healthcare | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	26,877	21,746
Commercial & Industrial | Healthcare | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,719	812
Commercial & Industrial | Healthcare | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,322	1,497
Commercial & Industrial | Independent Pharmacies
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	25,320	25,348
Loans Accounted for Under the Fair Value Option	78,540	79,787
Total Loans and Leases	103,860	105,135
Commercial & Industrial | Independent Pharmacies | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25,320	25,348
Commercial & Industrial | Registered Investment Advisors
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	40,269	42,421
Loans Accounted for Under the Fair Value Option	58,016	56,769
Total Loans and Leases	98,285	99,190
Commercial & Industrial | Registered Investment Advisors | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	40,269	42,421
Commercial & Industrial | Veterinary Industry
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	481	504
Total Carried at Amortized Cost	31,817	29,232
Loans Accounted for Under the Fair Value Option	20,643	21,799
Total Loans and Leases	52,460	51,031
Commercial & Industrial | Veterinary Industry | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	31,336	28,728
Commercial & Industrial | Veterinary Industry | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	481	504
Commercial & Industrial | Other Industries
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,908	10,435
Total Carried at Amortized Cost	458,838	410,158
Loans Accounted for Under the Fair Value Option	172,072	141,220
Total Loans and Leases	630,910	551,378
Commercial & Industrial | Other Industries | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	442,930	399,723
Commercial & Industrial | Other Industries | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,271	6,579
Commercial & Industrial | Other Industries | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,637	3,856
Construction & Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,387
Total Carried at Amortized Cost	372,597	347,318
Total Loans and Leases	372,597	347,318
Construction & Development | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	369,210	347,318
Construction & Development | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,387
Construction & Development | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	45,333	44,571
Total Loans and Leases	45,333	44,571
Construction & Development | Agriculture | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	45,333	44,571
Construction & Development | Funeral Home & Cemetery
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	9,146	9,033
Total Loans and Leases	9,146	9,033
Construction & Development | Funeral Home & Cemetery | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,146	9,033
Construction & Development | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,387
Total Carried at Amortized Cost	100,791	94,742
Total Loans and Leases	100,791	94,742
Construction & Development | Healthcare | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	97,404	94,742
Construction & Development | Healthcare | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,387
Construction & Development | Independent Pharmacies
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	720	443
Total Loans and Leases	720	443
Construction & Development | Independent Pharmacies | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	720	443
Construction & Development | Registered Investment Advisors
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	2,564	2,404
Total Loans and Leases	2,564	2,404
Construction & Development | Registered Investment Advisors | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,564	2,404
Construction & Development | Veterinary Industry
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	20,862	22,132
Total Loans and Leases	20,862	22,132
Construction & Development | Veterinary Industry | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20,862	22,132
Construction & Development | Other Industries
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	193,181	173,993
Total Loans and Leases	193,181	173,993
Construction & Development | Other Industries | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	193,181	173,993
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17,537	14,645
Total Carried at Amortized Cost	725,646	661,694
Loans Accounted for Under the Fair Value Option	351,817	385,650
Total Loans and Leases	1,077,463	1,047,344
Commercial Real Estate | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	708,109	647,049
Commercial Real Estate | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,279	9,059
Commercial Real Estate | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,258	5,586
Commercial Real Estate | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	1,291	30,066
Loans Accounted for Under the Fair Value Option	762	19,975
Total Loans and Leases	2,053	50,041
Commercial Real Estate | Agriculture | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,291	30,066
Commercial Real Estate | Funeral Home & Cemetery
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,817
Total Carried at Amortized Cost	58,699	55,243
Loans Accounted for Under the Fair Value Option	58,611	58,171
Total Loans and Leases	117,310	113,414
Commercial Real Estate | Funeral Home & Cemetery | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	58,699	53,426
Commercial Real Estate | Funeral Home & Cemetery | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,817
Commercial Real Estate | Healthcare
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,498	4,498
Total Carried at Amortized Cost	144,873	130,120
Loans Accounted for Under the Fair Value Option	107,437	115,887
Total Loans and Leases	252,310	246,007
Commercial Real Estate | Healthcare | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	140,375	125,622
Commercial Real Estate | Healthcare | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,498	4,498
Commercial Real Estate | Independent Pharmacies
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	822	930
Total Carried at Amortized Cost	9,431	9,000
Loans Accounted for Under the Fair Value Option	17,182	17,013
Total Loans and Leases	26,613	26,013
Commercial Real Estate | Independent Pharmacies | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,609	8,070
Commercial Real Estate | Independent Pharmacies | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		930
Commercial Real Estate | Independent Pharmacies | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	822
Commercial Real Estate | Registered Investment Advisors
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Carried at Amortized Cost	2,635	2,543
Loans Accounted for Under the Fair Value Option	4,591	4,913
Total Loans and Leases	7,226	7,456
Commercial Real Estate | Registered Investment Advisors | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,635	2,543
Commercial Real Estate | Veterinary Industry
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,042	2,815
Total Carried at Amortized Cost	72,873	68,743
Loans Accounted for Under the Fair Value Option	71,129	76,154
Total Loans and Leases	144,002	144,897
Commercial Real Estate | Veterinary Industry | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	68,831	65,928
Commercial Real Estate | Veterinary Industry | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,953	1,727
Commercial Real Estate | Veterinary Industry | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,089	1,088
Commercial Real Estate | Other Industries
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,175	4,585
Total Carried at Amortized Cost	435,844	365,979
Loans Accounted for Under the Fair Value Option	92,105	93,537
Total Loans and Leases	527,949	459,516
Commercial Real Estate | Other Industries | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	427,669	361,394
Commercial Real Estate | Other Industries | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,326	4,585
Commercial Real Estate | Other Industries | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,849
Commercial Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,170
Total Carried at Amortized Cost	270,266	234,133
Loans Accounted for Under the Fair Value Option	118,115	105,557
Total Loans and Leases	388,381	339,690
Commercial Land | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	268,096	234,133
Commercial Land | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,170
Commercial Land | Agriculture
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,170
Total Carried at Amortized Cost	270,266	234,133
Loans Accounted for Under the Fair Value Option	118,115	105,557
Total Loans and Leases	388,381	339,690
Commercial Land | Agriculture | Current or Less Than 30 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	268,096	$ 234,133
Commercial Land | Agriculture | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 2,170